glGetFragDataIndex — query the bindings of color indices to user-defined varying out variables
|const char * name|
The name of the program containing varying out variable whose binding to query
The name of the user-defined varying out variable whose index to query
glGetFragDataIndex returns the index of the fragment color to which the variable
name was bound when the program object
program was last linked. If
name is not a varying out variable of
program, or if an error occurs, -1 will be returned.
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